Forbedret fremgangsmÕte og anordning for adaptiv filtrering av støy for Õ pÕvise nede-i-hulls-hendelser

摘要

A method of detecting an event signal at the surface from a noise contaminated signal from a downhole source. The method involves detecting the noise contaminated signal with a detector, such as an accelerometer (20), filtering a substantial portion of the noise using an adaptive filter (24); and producing a cleaned output representation (26) of the event signal.